Question

The zone refining process is used for the

• A. The concentration of an ore
• B. Reduction of a metal oxide
• C. Purification of a metal
• D. Purification of an ore

Answer 1

The correct option is C

Purification of a metal

Explanation for correct option:

(C) Purification of a metal.

• Zone refining is a process employed for the purification of metals by molten crystals, and pure metal is obtained by recrystallization.
• The impure metal is converted into a rod and heated at one end using a heater.
• This method is employed for the purification of metals having a lower melting point.
• The impurities in the metals get molten and pure metal will leave behind.
• Eg: Bismuth, tin and lead. So, this is the correct option.

Explanation for incorrect option:

(A) The Concentration of ore.

• The concentration of ore is the purification of ore by crushing it, so it is an incorrect option.

(B) Reduction of a metal oxide

• The reduction of metal oxide comes under the smelting process, so it is also an incorrect option.

(D) Purification of an ore

• The purification of ore is called the concentration of ore, so it is also an incorrect one.

Therefore the correct option is (C) Purification of a metal.